Problem

Sparse matrices. An n-by-n matrix is sparse if its number of nonzeros is proportional to n...

Sparse matrices. An n-by-n matrix is sparse if its number of nonzeros is proportional to n (or less). Your goal is to represent a matrix with space proportional to n,and to be able to add and multiply two sparse matrices in time proportional to the total number of nonzeros (perhaps with an extra log n factor). Implement a class that supports the following API:

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